Materials Literature
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Abstract Comparative analyses of the 4f N (Ln 3+ ) energy level structures in a series of LiYF 4 :Ln 3+ systems are reported. These analyses focus on empirical energy level data currently available in the literature for the Pr 3+ , Nd 3+ , Eu 3+ , Dy 3+ , Ho 3+ , Er 3+ , and Tm 3+ systems, and they are based on the us…
The pitting corrosion of two duplex stainless steels was studied in chloride solutions. Phase compositions were determined by micro-analytical techniques and correlated with pitting behavior. The study showed that the pitting potential and the preferential pitting of the ferrite or austenite phase was dependent upon p…
Novel modeling and sensitivity analysis techniques are used with experimental data obtained from discharge flow–resonance fluorescence experiments to evaluate the product branching ratio of OH+H2CO. Two channels are considered: the H-atom abstraction reaction (R2) to form HCO and H2O; and the addition reaction (R17) f…
Upon the cw optical excitation of N-V centers in diamond, a spin alignment in the ensemble of nonexcited N-V defects in the electron spin-triplet ground state is induced. When the diamond sample is subjected to magnetic fields of suitable directions and strengths, cross relaxation (CR) and level anticrossing are found…
A method for the determination of rotational viscosity and elasticity associated with the director rotation on the C * cone is proposed. The method is based on measurements of the Goldstone mode dielectric strength and relaxation frequency, supplemented with values for spontaneous polarization, tilt angle and pitch. F…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBroad-band dielectric spectroscopy on a set of combined main-chain side-group liquid-crystalline polymersF. Kremer, S. U. Vallerien, R. Zentel, and H. KapitzaCite this: Macromolecules 1989, 22, 10, 4040–4045Publication Date (Print):October 1, 1989Publication History Publishe…
Galvannealed steel is an iron-zinc alloy coated steel produced by a diffusion process. The corrosion potentials and corrosion current of the various iron-zinc alloy phases present in the coating were measured in a neutral salt solution by employing coulometric and linear polarization techniques. In laboratory accelera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spectroscopy and structural characterization of five-coordinate, bis(aryldiazenido)technetium complexes and their protonation reactions. X-ray structure of [TcCl(PPh3)2(NNC6H4Br)2]Terrence Nicholson, Nadine De Vries, Alan Davison, and Alun G. JonesCite this: Inorg…
The GTP binding domain of the c-Ha-ras protooncogene product (p21'c) and the corresponding region from an oncogenic mutant form of the protein in which glycine at position 12 has been replaced by valine [p21'(G12V)] have been crystallized with P3-1-(2-nitro)phenylethylguanosine 5'-O-triphosphate (caged GTP) at their a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly of bilayer membranes in organic solvents by novel amphiphilic compoundsYuichi Ishikawa, Hiroaki Kuwahara, and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1989, 111, 22, 8530–8531Publication Date (Print):October 1, 1989Publication History Published online1 May 2…
Abstract XPS and contact angle measurement have been used to study oxygen–plasma‐treated polypropylene (PP) surfaces aged at variable temperatures. Surface rearrangement leading to low wettabillity has been observed, without alteration of the surface composition, as determined by XPS. Experimental results have been in…
Abstract The lattice parameters of a series of hydrogenated polybutadiene (HPB) model copolymers is measured as a function of branch content between 0 and 73 ethyl branches per 1000 C atoms. Expansion of the a and b axes nearly ceases for branch contents greater than 20 per 1000 C atoms. The c axis is seen to contract…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBound water in collagen: evidence from Fourier transform infrared and Fourier transform infrared photoacoustic spectroscopic studyV. Renugopalakrishnan, G. Chandrakasan, S. Moore, T. B. Hutson, C. V. Berney, and Rajendra S. BhatnagarCite this: Macromolecules 1989, 22, 10, 41…
Electrical properties of BaTiO 3 ‐based capacitors are investigated. A new model is developed to explain the frequency response of the impedance of grain‐boundary barrier layer (GBBL) capacitors. This model takes into consideration the dipole polarization effect and provides a simple and effective approach to evaluate…
Researchers have suggested that the increased longitudinal relaxation rates (1/T1) of solvent water protons often found in melanoma result either from the paramagnetism of stable free radicals occurring in melanin or from that of methemoglobin in nonacute hemorrhagic regions of the tumor. However, field-cycling relaxo…
The electrochemical properties of Cu‐tetra(pyrazino [2,3])‐[b,g,l,q]‐5,10,15,20‐tetraazaporphyrine, 4 , and Cu‐tetra(5,6‐dicyanopyrazino [2,3]) [b,g,l,q]‐5,10,15,20‐tetraazaporphyrine, 5 , as thin films in contact with an aqueous acid electrolyte were investigated by cyclic voltammetry. The electrodes show stable elec…
The effect of Fe and B 4 C on the sintering behavior and mechanical properties of TiB 2 ceramics have been studied. Sintering was performed in an Ar atmosphere at 2000° using attrition‐milled TiB 2 powder (mean particle size = 0.8 μm). When a small amount of Fe (0.5 wt%) was added, abnormal grain growth occurred and t…
Abstract Synthesis of novel triblock, polycaprolactone‐b‐polydimethylsiloxane (PDMS) and poly(2‐ethyl‐oxazoline)‐b‐PDMS copolymers were demonstrated. These materials were obtained via the ring‐opening polymerization of ϵ‐caprolactone or 2‐ethyl‐2‐oxazoline monomers by using organofunctionally terminated PDMS oligomers…
β‐Spodumene glass‐ceramic compositions were melted and studied. Compositional variations were made in the three major components as well as through minor additions of other oxides. Sintering characteristics and microstructures were studied and values for crystallization temperature, melting temperature, and crystalliz…